Where should I park that money in?

My dad doesn't want to accept the pocket money that I want to give him since I started working. For my mum, she got me to put in her CPF account to earn interest and for me to save on tax. My dad didn't want me to do it either.

I'm looking for a higher yield savings account / risk free account that I can park the money in, so that in the future, if he needs the money, he can just take the money wholesale immediately. Any advice, pls?

Am looking at cash management accounts but it seems like there are some costs involved, and it's either low risk but low returns, or high risks with high returns but a possibility of losing money as well. So I'm not sure if I want to venture into cash management accounts.